CN105835207B - Sand mold printing device and its Method of printing - Google Patents
Sand mold printing device and its Method of printing Download PDFInfo
- Publication number
- CN105835207B CN105835207B CN201610168437.5A CN201610168437A CN105835207B CN 105835207 B CN105835207 B CN 105835207B CN 201610168437 A CN201610168437 A CN 201610168437A CN 105835207 B CN105835207 B CN 105835207B
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- CN
- China
- Prior art keywords
- assistant formation
- formation material
- moulding material
- plated
- elevating hopper
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/001—Rapid manufacturing of 3D objects by additive depositing, agglomerating or laminating of material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
- B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Ceramic Engineering (AREA)
Abstract
The sand mold printing device and its Method of printing of a kind of 3D printing technique field, including：Pedestal, shaping boxcar, blanking support, selectivity are plated in mechanism, blanking mechanism, moulding material elevating hopper, assistant formation material elevating hopper, moulding material conveying mechanism, assistant formation material transport mechanism structure and control unit, wherein：Pedestal is provided with guide rail, print platform is movably set in shaping box in-car, shaping boxcar is flexibly connected with guide rail, blanking support is set up in above guide rail and is fixedly connected with pedestal, selectivity is plated in mechanism and blanking mechanism and is in turn secured to from the bottom up on blanking support, moulding material elevating hopper and assistant formation material elevating hopper are disposed alternately on blanking mechanism, and moulding material conveying mechanism and assistant formation material transport mechanism structure are connected with moulding material elevating hopper, assistant formation material elevating hopper respectively.The present invention is plated in moulding material and assistant formation material using line molding mode, selectivity, realizes the 3D printing of sand mo(u)ld, it is possible to increase shaping speed.
Description
Technical field
The present invention relates to a kind of technology in 3D printer field, specifically a kind of sand mold without reverse mould prints
Equipment and its Method of printing.
Background technology
Current domestic foundry sand moulds printing device be limited in single nozzle filled or combined by track CNC technologies successively according to
It is secondary to be plated in molding sand and binding agent, then cut as desired, shaping speed is slow, efficiency is low；And overseas equipment utilizes more shower nozzle battle arrays
Row are successively plated in auxiliary roughing sand successively and curing agent, shower nozzle move along two dimensional surface.Prior art is spot scan or dot matrix
Scanning shaping, speed is slower, is particularly applied in terms of printing heavy castings sand mo(u)ld.
Found by the retrieval to prior art, Chinese patent literature CN105235221A, open (bulletin) day
2016.01.13, a kind of 3D printer and its Method of printing, including print platform and carrying platform, the print platform are disclosed
It is provided with and is in conplane N number of printing nozzle, wherein, N>1；Each printing nozzle is equipped with independent control printing nozzle
Switch；Printing nozzle corresponds with switch；Print platform only carries out the motion of two dimensions.Printing nozzle along print platform not
The regularly arranged print platform in third dimension direction of motion also includes charging gear and feed bin；Charging gear is fixedly installed in
Bin bottom；The printing nozzle is fixedly installed in charging gear bottom by switch.Side of the technology by shower nozzle according to dot matrix
Arrangement is fixed in formula, and nozzle is two axle movement printing model, and print platform carries out two dimensional motion, and it still uses point in itself
The mode of shaping carries out forming moving, and print speed is slower.
The content of the invention
The present invention is directed to deficiencies of the prior art, it is proposed that a kind of sand mold printing device and its printing side
Method, the production efficiency of casting die can be improved by line molding mode.
The present invention is achieved by the following technical solutions,
The present invention relates to a kind of sand mold printing device, including：Pedestal, shaping boxcar, blanking support, selectivity are plated in
Mechanism, blanking mechanism, moulding material elevating hopper, assistant formation material elevating hopper, moulding material conveying mechanism, assistant formation material
Conveying mechanism and control unit, wherein：Pedestal is provided with guide rail, and print platform is up and down to be arranged at shaping box in-car, shaping box
Car is flexibly connected with guide rail, and blanking support is set up in above guide rail and is fixedly connected with pedestal, is selectively plated in mechanism and blanking
Mechanism is in turn secured on blanking support from the bottom up, and moulding material elevating hopper and assistant formation material elevating hopper are disposed alternately at
On blanking mechanism, moulding material conveying mechanism and assistant formation material transport mechanism structure respectively with moulding material elevating hopper, auxiliary into
Section bar material elevating hopper is connected；
Described selectivity is plated in mechanism and is divided into two longitudinal row, including：Several sizes are identical and the spray that is arranged in order
Head and the erection joint positioned at both ends, wherein the shower nozzle of a row is correspondingly arranged up and down with moulding material elevating hopper, another row
Shower nozzle is correspondingly arranged up and down with assistant formation material elevating hopper, and erection joint is fixedly connected with blanking support；
Described control unit is connected with shaping boxcar and output displacement control signal, control unit are connected with print platform
And height control signal is exported, control unit is connected simultaneously with moulding material conveying mechanism and assistant formation material transport mechanism structure respectively
Export moulding material, assistant formation material conveying signal, control unit with selectivity be plated in mechanism be connected simultaneously output nozzle switch
Opening and closing signal.
Described moulding material conveying mechanism and assistant formation material transport mechanism structure respectively with moulding material feed bin, auxiliary into
Section bar material feed bin is connected.
The method that said apparatus carries out sand mold printing is the present invention relates to the use of, is comprised the following steps：
S1, hierarchy slicing data are generated using the threedimensional model of sand mo(u)ld, and the requirement of each slicing layer filling region is combined, it is raw
Into the automatically controlled data for printing；
S2, control unit utilizes automatically controlled digital simulation print procedure, it is ensured that the correctness of automatically controlled data；Simultaneously according to simulation
Print result adjusts the precision of hierarchy slicing data, hierarchy slicing data and automatically controlled data after being corrected；
S3, after Data correction, control unit control shaping boxcar drives into print area and carries out equipment self-inspection, it is ensured that device
It is working properly；
S4, after the completion of self-test, control unit controls moulding material conveying mechanism and assistant formation material transport mechanism structure respectively
Moulding material, assistant formation material are transmitted, moulding material, assistant formation material are respectively through moulding material elevating hopper, assistant formation
Material elevating hopper enters selectable and is plated in mechanism；Control unit control shaping boxcar moves back and forth on guide rail, while controls spray
Head switch opening and closing causes moulding material and assistant formation material selectively to fall into print platform, has often printed one layer of print platform
Decline a thickness, until completing the printing of whole slicing layers；
5th step, after completing printing, control unit control shaping boxcar is moved to initial position, then controls print platform
Modulus position is increased to, complete machine enters stopped status.
Technique effect
Compared with prior art, the present invention is using the 3D printing that sand mo(u)ld is carried out by the line molding mode of line to face, Neng Gouti
High shaping speed；And selectivity is plated in the multigroup shower nozzle of bull of mechanism or bull single group shower nozzle and can also dynamically control forming material
Material and assistant formation material blanking, shaping speed is further improved, shorten the time-write interval, and avoid single shower nozzle injection solidification
The too high situation for causing sand mo(u)ld intensity to decline of curing agent content occurs during agent.
Brief description of the drawings
Fig. 1 is the dimensional structure diagram of the present invention；
Fig. 2 is the structural representation that mechanism is selectively plated in embodiment 1, wherein：(a) it is three-dimensional structure view, (b) is
Side view；
Fig. 3 is the structural representation that mechanism is selectively plated in embodiment 2, wherein：(a) it is three-dimensional structure view, (b) is
Side view；
Fig. 4 is selectively to be plated in mechanism nozzle switch servo antrol schematic diagram in embodiment 3；
Fig. 5 is the multigroup nozzle structure schematic diagram of bull that mechanism is selectively plated in the present invention；
Fig. 6 is the structural representation that mechanism is selectively plated in embodiment 4；
Fig. 7 is that the selectivity of single shower nozzle in embodiment 4 is plated in mechanism structure schematic diagram；
Fig. 8 is the structural representation of rotary switch in the present invention；
Fig. 9 is the structural representation of moulding material elevating hopper or assistant formation material elevating hopper in the present invention；
Figure 10 is the structural representation of blanking mechanism in the present invention；
In figure：Pedestal 1, shaping boxcar 2, print platform 3, blanking support 4, selectivity be plated in mechanism 5, blanking mechanism 6, into
Section bar material elevating hopper 7, assistant formation material elevating hopper 8, assistant formation material transport mechanism structure 9, moulding material conveying mechanism 10, into
Section bar material feed bin 11, assistant formation material feed bin 12, guide rail 13, shower nozzle 14, nozzle switch 15, erection joint 16, convex mouth 17, control
Unit 18 processed, feeding slit 19, blanking slit 20.
Embodiment
Embodiments of the invention are elaborated below, the present embodiment is carried out lower premised on technical solution of the present invention
Implement, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to following implementation
Example.
Embodiment 1
As shown in figure 1, the present embodiment includes：Pedestal 1, shaping boxcar 2, blanking support 4, selectivity are plated in mechanism 5, blanking
Mechanism 6, moulding material elevating hopper 7, assistant formation material elevating hopper 8, assistant formation material transport mechanism structure 9, moulding material conveying
Mechanism 10 and control unit 18, wherein：Pedestal 1 is provided with guide rail 13, and print platform 3 is up and down to be arranged in shaping boxcar 2, into
Molding box car 2 is flexibly connected with guide rail 13, and blanking support 4 is set up in the top of guide rail 13 and is fixedly connected with pedestal 1, is selectively plated in
Mechanism 5 and blanking mechanism 6 are in turn secured on blanking support 4 from the bottom up, on moulding material elevating hopper 7 and assistant formation material
Hopper 8 is disposed alternately on blanking mechanism 6, assistant formation material transport mechanism structure 9 and moulding material conveying mechanism 10 respectively with it is auxiliary
Moulding material elevating hopper 8, moulding material elevating hopper 7 is helped to be connected；
As shown in Figure 2 and Figure 5, described selectivity be plated in mechanism 5 be divided to for longitudinal direction two row, including：Several size phases
Same and the shower nozzle 14 being arranged in order and the erection joint 16 positioned at both ends, wherein the shower nozzle 14 and moulding material elevating hopper of a row
About 7, which are correspondingly arranged control moulding material, is plated in, and shower nozzle 14 and the assistant formation material elevating hopper of another row are correspondingly arranged about 8
Control assistant formation material is plated in, and erection joint 16 is fixedly connected with blanking support 4；The total length of described each row shower nozzle 14 with
The width of print platform 3 is identical；
Described control unit 18 is connected with shaping boxcar 2 and output displacement control signal, control unit 18 are flat with printing
Platform 3 is connected and exports height control signal, and control unit 18 conveys with assistant formation material transport mechanism structure 9 and moulding material respectively
Mechanism 10 is connected and exports assistant formation material, moulding material conveying signal, and control unit 18 is plated in mechanism 5 with selectivity and is connected
And the signal of the opening and closing of output nozzle switch 15.
It is preferably 4 groups that described selectivity, which is plated in mechanism 5,.
As shown in Figure 2 and Figure 8, described selectivity is plated in that mechanism 5 is wide at the top and narrow at the bottom, and bottom is triangular in shape, described shower nozzle
Switch 15 is rotary controlling switch, V-shaped, and the lower rotation that mechanism 5 is plated in selectivity is connected, certain by rotating
Angle block any side material outlet, realize that selectivity is plated in.
Described assistant formation material transport mechanism structure 9 and moulding material conveying mechanism 10 respectively with assistant formation material feed bin
12nd, moulding material feed bin 11 is connected.
As shown in figure 9, the inside of described moulding material elevating hopper 7, assistant formation material elevating hopper 8 is provided with helical feed
Device, bottom are provided with feeding slit 19 so that material enters in blanking mechanism 6.
As shown in Figure 10, the inside of blanking mechanism 6 is provided with metering device, and bottom is provided with blanking slit 20 so that
Material dosing is transferred to selectivity and is plated in mechanism 5.
The present embodiment relates to the use of the method that said apparatus carries out sand mold printing, comprises the following steps：
S1, hierarchy slicing data are generated using the threedimensional model of sand mo(u)ld, and the requirement of each slicing layer filling region is combined, it is raw
Into the automatically controlled data for printing；
S2, the automatically controlled digital simulation print procedure of the utilization of control unit 18, it is ensured that the correctness of automatically controlled data；Simultaneously according to mould
Intend the precision of print result adjustment hierarchy slicing data, hierarchy slicing data and automatically controlled data after being corrected；
S3, after Data correction, the control shaping boxcar 2 of control unit 18 drives into print area and carries out equipment self-inspection, it is ensured that
Device is working properly；
S4, after the completion of self-test, control unit 18 controls assistant formation material transport mechanism structure 9 and moulding material conveyer respectively
Structure 10 transmits assistant formation material, moulding material, and moulding material, assistant formation material are respectively through moulding material elevating hopper 7, auxiliary
Moulding material elevating hopper 8, blanking mechanism 6 enter selectable and are plated in mechanism 5；The control shaping boxcar 2 of control unit 18 is in guide rail 13
On move back and forth, while control the anglec of rotation of nozzle switch 15 so that moulding material and assistant formation material are selectively fallen into
Print platform 3, one layer of print platform 3 is often printed and has declined a thickness, until completing the printing of whole slicing layers；
S5, after completing printing, the control shaping boxcar 2 of control unit 18 is moved to initial position, then controls print platform 3
Modulus position is increased to, complete machine enters stopped status.
Embodiment 2
It is with the difference of example 1, as shown in figure 3, described selectivity is plated in, mechanism 5 is wide at the top and narrow at the bottom, and bottom is in wedge
Shape is simultaneously provided with convex mouth 17, and described nozzle switch 15 is linear motor switch and is disposed alternately at the both sides of convex mouth 17；Described
Nozzle switch 15 at work, can block any side of convex mouth 17, realize the whereabouts of opposite side material, and then realize shaping
The selectivity of material and assistant formation material is plated in.
Embodiment 3
It is with the difference of example 1, as shown in figure 4, described selectivity, which is plated in mechanism 5, is provided with trailing type nozzle switch
15, trailing type nozzle switch 15 is overall to be moved back and forth along longitudinal direction；Carry out transversal scanning be plated in while, dynamically according into
Type demand modeling moulding material and assistant formation material blanking scope；If trailing type nozzle switch 15 closes, fall auxiliary into
Section bar material, otherwise falls moulding material.
Embodiment 4
It is with the difference of example 1, as shown in fig. 7, described selectivity, which is plated in mechanism 5, only has a shower nozzle 14,
Described shower nozzle 14 carries out selectivity in its corresponding scope and is plated in, but working range is limited；In order to improve shaping speed, increase
The movement dimension of shower nozzle, it move back and forth as shown in fig. 6, shower nozzle 14 can be plated in the length direction of mechanism 5 along selectivity.
It is flat perpendicular to the vibration-direction of print platform 3 and printing that described selectivity is plated in its length direction of mechanism 5
Platform 3 is vertically moved up or down direction.
Described shower nozzle 14 can be divided into several junior units, and precision is plated in improve.
The present embodiment is at work：First, shaping boxcar 2 moves to the direction of shower nozzle 14, when print platform 3 one reaches shower nozzle
14 are plated in position, and shaping boxcar 2 is stop motion；Then shower nozzle 14 is plated in the length direction of mechanism 5 and moved and goes forward side by side along selectivity
Row selectivity is plated in, the distance of the mobile shower nozzle width every time of shower nozzle 14 until complete the printing on a length direction, it
After return to initial position；Then shaping boxcar 2 continues to move to, and carries out next place's printing, to the printing for completing a slicing layer；Weight
Multiple above-mentioned steps, until printing the printing of whole slicing layers, print platform 3 retracts initial position.
Claims (8)
- A kind of 1. sand mold printing device, it is characterised in that including：Pedestal, shaping boxcar, blanking support, selectivity are plated in Mechanism, blanking mechanism, moulding material elevating hopper, assistant formation material elevating hopper, moulding material conveying mechanism, assistant formation material Conveying mechanism and control unit, wherein：Pedestal is provided with guide rail, and print platform is movably set in shaping box in-car, shaping boxcar with Guide rail is flexibly connected, and blanking support is set up in above guide rail and is fixedly connected with pedestal, is selectively plated in mechanism and blanking mechanism It is in turn secured to from the bottom up on blanking support, moulding material elevating hopper and assistant formation material elevating hopper are disposed alternately at blanking In mechanism, moulding material conveying mechanism and assistant formation material transport mechanism structure respectively with moulding material elevating hopper, assistant formation material Material elevating hopper is connected；Described selectivity is plated in mechanism and is divided into two longitudinal row, including：Several sizes are identical and the shower nozzle that is arranged in order with And the erection joint positioned at both ends, wherein the shower nozzle of a row is correspondingly arranged up and down with moulding material elevating hopper, the shower nozzle of another row It is correspondingly arranged up and down with assistant formation material elevating hopper, erection joint is fixedly connected with blanking support.
- 2. sand mold printing device according to claim 1, it is characterized in that, described control unit is with being molded boxcar phase Even and output displacement control signal, control unit are connected with print platform and export height control signal, control unit respectively with Moulding material conveying mechanism is connected with assistant formation material transport mechanism structure and exports moulding material, the conveying of assistant formation material is believed Number, control unit with selectivity be plated in mechanism be connected and output nozzle switch opening and closing signal.
- 3. sand mold printing device according to claim 1, it is characterized in that, described selectivity is plated in mechanism under width Narrow, bottom is triangular in shape, and bottom surface is provided with nozzle switch.
- 4. sand mold printing device according to claim 1, it is characterized in that, described selectivity is plated in mechanism under width Narrow, bottom is wedge shaped and is provided with nozzle switch and convex mouth.
- 5. the sand mold printing device according to Claims 2 or 3 or 4, it is characterized in that, described nozzle switch is rotation Formula controlling switch.
- 6. sand mold printing device according to claim 4, it is characterized in that, described nozzle switch is linear motor Switch, is disposed alternately at convex mouth both sides.
- 7. sand mold printing device according to claim 1 or 2, it is characterized in that, described moulding material conveying mechanism It is connected respectively with moulding material feed bin, assistant formation material feed bin with assistant formation material transport mechanism structure.
- 8. a kind of sand mo(u)ld Method of printing using equipment described in any of the above-described claim, it is characterised in that comprise the following steps：S1, hierarchy slicing data are generated using the threedimensional model of sand mo(u)ld, and the requirement of each slicing layer filling region is combined, generation is used In the automatically controlled data of printing；S2, control unit utilizes automatically controlled digital simulation print procedure, it is ensured that the correctness of automatically controlled data；Printed simultaneously according to simulation As a result the precision of hierarchy slicing data, hierarchy slicing data and automatically controlled data after being corrected are adjusted；S3, after Data correction, control unit control shaping boxcar drives into print area and carries out equipment self-inspection, it is ensured that device works Normally；S4, after the completion of self-test, control unit control respectively moulding material conveying mechanism and assistant formation material transport mechanism structure transmit into Section bar material, assistant formation material, moulding material, assistant formation material are respectively through on moulding material elevating hopper, assistant formation material Hopper enters selectable and is plated in mechanism；Control unit control shaping boxcar moves back and forth on guide rail, while controls nozzle switch Opening and closing causes moulding material and assistant formation material selectively to fall into print platform, has often printed one layer of decline, one thickness, Until complete the printing of whole slicing layers；S5, after completing printing, control unit control shaping boxcar is moved to initial position, then controls print platform to be increased to take Mould position, complete machine enter stopped status.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610168437.5A CN105835207B (en) | 2016-03-23 | 2016-03-23 | Sand mold printing device and its Method of printing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610168437.5A CN105835207B (en) | 2016-03-23 | 2016-03-23 | Sand mold printing device and its Method of printing |
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| Publication Number | Publication Date |
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| CN105835207A CN105835207A (en) | 2016-08-10 |
| CN105835207B true CN105835207B (en) | 2018-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610168437.5A Expired - Fee Related CN105835207B (en) | 2016-03-23 | 2016-03-23 | Sand mold printing device and its Method of printing |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107127306B (en) * | 2017-06-07 | 2024-01-19 | 第一拖拉机股份有限公司 | Device for 3D printing precision casting mold shell and use method |
| CN107755630A (en) * | 2017-11-29 | 2018-03-06 | 宁夏共享模具有限公司 | A kind of new 3DP printers and its sanding Method of printing |
| CN108638289B (en) * | 2018-04-26 | 2019-11-26 | 东北大学 | A kind of large complicated geology physical model 3D formation system |
| CN108437155B (en) * | 2018-04-26 | 2020-04-14 | 东北大学 | Large-scale complicated geology physical model 3D make-up machine |
| CN108839338B (en) * | 2018-05-28 | 2020-11-10 | 共享智能铸造产业创新中心有限公司 | Three-dimensional model slicing method based on FDM equipment |
| CN108526400A (en) * | 2018-06-28 | 2018-09-14 | 四川大学 | A kind of quick molding sand 3D printing device |
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| CN203887992U (en) * | 2014-05-28 | 2014-10-22 | 宁夏共享模具有限公司 | 3D (three-dimensional) printing equipment with high-efficiency printing head |
| CN104552556A (en) * | 2013-10-27 | 2015-04-29 | 西安中科麦特电子技术设备有限公司 | Spreading hopper for 3D (three-dimensional) printing of ceramic materials |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0968776A1 (en) * | 1994-05-27 | 2000-01-05 | EOS GmbH ELECTRO OPTICAL SYSTEMS | Process for use in foundry practice |
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| CN105835207A (en) | 2016-08-10 |
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